<h4>Tool</h4><table border="0"><tr><td valign="top"><b>Name</b></td><td valign="top">Surface Specific Points</td></tr><tr><td valign="top"><b>ID</b></td><td valign="top">3</td></tr><tr><td valign="top"><b>Author</b></td><td valign="top">(c) 2001 by O.Conrad</td></tr><tr><td valign="top"><b>Specification</b></td><td valign="top">grid</td></tr></table><hr><h4>Description</h4>References:
Peucker, T.K. and Douglas, D.H., 1975:
'Detection of surface-specific points by local parallel processing of discrete terrain elevation data',
Computer Graphics and Image Processing, 4, 375-387
<hr><h4>Parameters</h4><table border="1" width="100%" valign="top" cellpadding="5" rules="all"><tr><th>Name</th><th>Type</th><th>Identifier</th><th>Description</th><th>Constraints</th></tr>
<tr><th colspan="5">Input</th></tr><tr><td>Elevation </td><td>Grid (input)</td><td>ELEVATION</td><td></td><td></td></tr><tr><th colspan="5">Output</th></tr><tr><td>Result</td><td>Grid (output)</td><td>RESULT</td><td></td><td></td></tr><tr><th colspan="5">Options</th></tr><tr><td>Method</td><td>Choice</td><td>METHOD</td><td>Algorithm for the detection of Surface Specific Points</td><td>Available Choices:
[0] Mark Highest Neighbour
[1] Opposite Neighbours
[2] Flow Direction
[3] Flow Direction (up and down)
[4] Peucker & Douglas
Default: 1</td></tr><tr><td>Threshold</td><td>Floating point</td><td>THRESHOLD</td><td>Threshold for Peucker & Douglas Algorithm</td><td>Default: 2.000000</td></tr></table>